Apparatus for molding cast iron pipes and the like



May 10, 1932. McwANE 1,857,855

APPARATUS FOR MOLDING CAST IRON PIPES AND THE LIKE Original Filed MarchlQ, 1928 2 Sheets-Sheet '1 ATTORNEYS J. R. M WANE May 10, 1932 APPARATUS FOR MOLDING CAST IRON PIPES AND THE LIKE J 2 y 2 n/a @J/ L r a w Jn m W IJH qr fl a 6 m u u s 2 u 7 JUN T r Z m 6 9 l fl m m m u a 7 W F nn H- l n a H n 6 m u a m n 7 i n 7. u w u HHH 0 m Patented May 10, 1 932 UNITED STATES PATE NT orrlcs JAMES R. MCWANE, or BIRMINGHAM, ArAnAM ASSIGNOR TO MGWANE CAST IRON H PIPE COMPANY, or BIRMINGHAM, ALABAMA; A CORPORATION on ALABAMA APPARATUS FOR MOLDING CAST IRON PIPES AND THE LIKE Original application filed March 19, 1928, Serial No. 262,683. Dividedand this application filed March 18, d 1930. Serial No 436,7 5 1. r

This invention relates to apparatus which is advantageously used for molding long cast iron pipes, although capable of other uses, and, among other objects, aims to provide an 5 improved pattern plate and improved flask sections co-operating therewith to expedite making multiple molds. The apparatus is preferably employed in connection with the system described and claimedin my copending application, Serial No. 220,731, filed September 20, 1927, now Patent No. 1,808,366, dated June 2, 1931.

This application is a division of my copending application, Serial No. 262,683, filed March 19,1928, now Patent No. 1,765,021,

green sand process, the practice heretofore dated June 17, 1930.] 7

Referring to the accompanying drawings of a preferred form of the invention Fig. 1 is a top plan viewof the drag sec Fig. 2 is an elevation of a portion of a jolt rammer with the pattern plate thereon,

the patterns being in section, and a' flask sec tion shown above the pattern plate in cross "section and ready to be rammed;

on an enlarged scale, of the holding means of Fig. 3; Fig. 6 is a fragmentary one end of the pattern plate showing a guide pin for aflask section. i i

In the manufacture of cast iron pipe in horizontal molds, by what is known as the has been to use a molding machine having a stripping plate and drop pattern. One section of the flask is rammed at a time, and

the rammed sections are removed and 45 matched together with the core bar or bars between them.

There are some objections to thefuse of these stripping plates and drop patterns, the

principal objection being that, in the course "of time, the patterns and stripping plates sectional view of both wear and it is then quite ditficult to keep them properly adjusted, Moreover, the

mechanism of the drop pattern will not with-' stand rough usage to which it would be subjected if placed on a jblt rammer. There:

fore, when employing the system heretofore in use, it has been necessary to ram the'flasks by hand, which is laborious, expensive, and

slow.

Tospeedfup production and to economize 1n the manufacture of cast iron pipes and the like, it is highly desirable to employ the jolt ramming machines. To use this ram ming apparatus successfully, it isnecessary to employ pattern plates or match plates; Such pattern plates have one-half of the pat ing, each pattern plate in one operation.

forms one-half of one or more pipe molds and these halves (the flask sections) are subsequently matched together, with the" cores properly placed in the molding space to make is; In the manufacture'of long cast iron pipe, the long flask sections are subjected to lateral" and longitudinal displacement relative to the pattern plates and this also'results in destruction of or serious injury to the. molds." Hence, it is highly desirable positively to hold the flask sections between their ends to,

the complete mold.

the pattern plate, a nd by holding means such, 7 as are capable'of being used when the flask sections become warped or permanently deformed. I

Referring specifically to the drawings,-

there is shown in Fig. 1 adrag section 10 of a multiple pipe flask designed to be employed in conjunction with a pattern plate, the drag shown also typifying the construction ofthe cope, which is not shown. .Hereln, thedrag section s shown as having provision for molding four long sections of pipe atone:

time although it is to be distinctly understood i that any-convenient number of pipe sections maybe made, within the mechanical limits of'the apparatus. The drag shown is-fgener j V ally rectangular in outline'and has a single] pair of axially aligned trunnions llarra'nged parent applicationserial No. 262,683, so that the above general description of the flask section will suffice. V

Refe'rringto Fig. 2, the drag section is shown applied to a pattern plate 15 o'n the surface of Which issecured a plurality of half pipe patterns 16. The pattern plateis preferably approximatel the same width as the'flasksections10. f To guide the flasksection'on'the pattern plateand toprevent relativelongitud'inal displacement, as well as lateral displacement at the ends thereof, tapered guide pins 17 (Fig. 6) are provided at diagona'll'y opposite corners of the pattern plate 15 and co-op 'r'afte with'bushedholes or openings 18in thefla'sk section (Fig. 1). One of the holes is shown asbeing substantially elliptical's'o that it will receive its pin notwithstanding slight variations in length of the flask section,'due to expansion or contraction. The'pimhowever, cannot move laterally or longitudinally in the elliptical hole 18, when theother "pin is in'itshole. V

To'holdthe flask section intermediately to the pattern plate; a pair of opposed brackets 19/(Figs 2, Sand '5) 'are' shown as being'bolted to the sides-of thepattern plate15 and have overhanging portions for receiving holding wedges2'0' between opposed, comslightly warped flask sections.

pound tapered faces'21 thereon andthe vertical plane faces 22 of co-acting bosses or pads"23 on theside w'alls'24 of the flask sectifon '1'l). The taper of thefwedges is both longitudinal and transverse l) so that when the wedges are inserted between the wedge-receiving faces, their thickest portions atthe'b'ottom rest against a suitable shoulder 25 on the brackets whereby they tighten themselves automatically when the jolt ram- Iner 26 is reciproeated-u and down. The described wedge means will engage and hold Moreover, the arra'ngementis'suchthat the plane faces Q fjthe wedg6$ which engage the bosses or pads 23 arealso vertical andact as lateral guides for the flasks when they are being li fted from the pattern plate, thus preventin'g 'ratting. After the flask section is thus immovably secured on the'pattern plate, it is supplied with green sandand the jolt rammer 26 is operated. The section is'j olted until the' sand well ra'mmedfjthen the ramming operation is completed by manually controlled pneumatic rammers.

To permit the flask sections to be removed from the pattern plate without destroying any part of the mold or without ratting, the patterns 16 (Figs. '2 and 7) are shown as being flattened or cut away adjacent to their junctions with the surface of the pattern plate. If the pattern were not cut away there would be a portion of its surface adj acent to the junction with the pattern plate which would be "substantially vertical. Hence, there would not be suflicient draft for the pattern's'to permit the flask sections to be removed without destroying the molds.

- Herein, the patterns have planed surfaces 27 extending upwardly at an angle of a few degrees' from their junctions with the pattern plate to afiord ample draft. I have found by many hundreds of trials that 'it only necessary to cut away a few thousandths'of an inch of the thickness of the pattern to provide this draft. Figs. 2 and 7 greatly ex-- aggerate the "flattened surfaces of the patterns so as to make them apparent. This feature of the invention is described and claimed in an application whichis another division of the above-identified parent application.

, From the foregoing descriptiomit will be seen that the improved apparatushere described permits rapid preparation of pipe molds and' thelike practically entirely .by mechanical means. There are no parts of the patterns or flask sections which can be. distorted during the ramming operation. The apparatus makes practically perfect molds and will therefore permit the manufacture of long sections of pipes having thinner walls than could be produced by old methods. V V

Obviously, the present invention is not restricted to the particular embodiment thereof herein shown and described. Moreover, it is not indispensable that allthe features of the invention be use'd ,conjointly, sincethey may be employed advantageously in various combinations and sub-combinations.

What I claim is:

1. Apparatus for molding long. castings comprisin'g,in combination, a patternplate having an elongated patternpart secured thereto; a flask'section adapted to be placed on the'pattern plate; means toprevent longitudinal displacement of the flask section on the pattern plate and lateral displacement at the ends thereof; and self tightening wedges driven between and co opera'ting with the pattern plate and flasksection interl mediate the ends thereof and on opposite sides of the flask section to prevent relative lateral displacement. r

'2. Apparatus for molding long castings comprising, in combination, a pattern plate having an elongated pattern part secured thereto; a flask section adapted to be placed on the pattern plate; means to prevent longitudinal displacement of the flask section on the pattern plate; and wedge means engaging the flask section and the pattern plate on opposite sides to prevent relative lateral movement and separation.

3. Apparatus for molding long castings comprising, in combination, a pattern plate having an elongated pattern part secured thereto; a flask section adapted to be placed on the pattern plate; means to prevent longitudinal displacement of the flask section on the pattern plate and lateral displacement at the ends thereof; a pair of wedge members engaging opposed faces adjacent to the side edges of said flask section and pattern plates about midway between their ends, said wedges adapted to engage slightly warped flask sections.

4. Apparatus for molding long castings comprising, in combination, a pattern plate having an elongated pattern part secured thereto; a flask section adapted to be placed on the pattern plate; means to prevent longitudinal displacement of the flask section on the pattern plate and lateral displacement at the ends thereof; and wedges which taper both longitudinally and laterally co-operate ing with complimentary surfaces on the pattern plate and flask section intermediate the ends thereof and on opposite sides of the flask section to prevent relative lateral displacement.

5. Apparatus for molding long castings comprising, in combination, a pattern plate having an elongated pattern part secured thereto; a flask section adapted to be placed on the pattern plate; tapered guide pins at diagonally opposite corners o the pattern plate co-operating with corresponding openings in the flask section to prevent longitudinal displacement of the flask section on the pattern plate; oneof said pins fitting its hole snugly, so that movement is obviated; the other hole being elliptical, and the pin being in contact with the two sides but not the ends, so that expansion and contraction does not prevent registry of both pins with their holes, while lateral displacement at the ends is eliminated.

6. In combination with a flask section and pattern plate for molding long castings and the like, pairs of opposed, wedge-engaging surfaces on opposite sides of the flask section and pattern plate, and a pair of wedges adapted to be driven longitudinally of the flask section to be tightened between the opposed surfaces to prevent relative lateral displacement.

7. In combination with a flask section and pattern plate for molding long castings, pairs of opposed wedge-receiving faces on opposite sides of the pattern plate and flask section; and self-tightening wedges between said faces to prevent relative lateral displacement of the flask section and pattern plate.

8. In combination with a flask section and pattern plate for molding long castings, pairs of opposed wedge-receivingfaces on opposite sides of the pattern plateand flasksection; and wedges tapered both laterally and longitudinally'adapted to be driven between said wedge-receiving faces to prevent relative lateral displacement of the flask section and relative "lateral displacement of;the "pattern plate and flask section. I

10; A pattern plate for the molding of cast iron pipes or other elongated castingspro vided with a guide pm at each end for properly matching the flask sectionstherewith; and central, lateral guides consisting of a bracket on each side having an inner surface adapted to engage with a wedge on the opposite side thereof.

11. A pattern plate for the molding of cast iron pipes or other elongated castings provided with a guide pin at each end for properly matching the flask sections therewith; and central, lateral guides consisting of a bracket on either side adapted to engage a wedge on the outside thereof; said guides being tapered both horizontally from end to end and vertically from bottom to top to prevent loosening of the wedges during the ramming process.

12. In combination with a pattern plate and flask section for pipe molds, wedge means driven between complemental surfaces on the pattern plate and flask section to hold the flask section against lateral displacement on the pattern plate, said wedges presenting the pattern plate presenting wedge-receiving V faces; co-acting wedge-receiving faces on the flask section; and wedges adapted to be inserted between said faces to hold the intermediate portions of the flask section against lateral displacement, the flask-engaging faces of said wedges affording guides for the plate and flask section for 4' lemme rammed flask section when i is lifted from the match ,platewhereby to prevent fratting,

1 1. Apparatus for'molding long castings 15' comprising, in combination, a pattern plate;

a flask section adapted to be placed on the pattern plate; said flask se tion having o plane vertical surfaces on opposite sides intermediate the ends; said pattern plate hav- 10 ing two surfaces outside of and op' posed to the aforesaid surfaces p ovide o the flask section Which are slightl closed atthe-tops and at'one'end (to the a oresaidsunfaees on the flask section; and Wedges which taper II both longitudinally and laterally adapted to be driven in between-the two i opposed surfaeeson oppositesides ofthe flask,thethinner end of-eao'h Wedge being inwardly and the thicker longitudinal edge of each Wedge my being lowermost when'the wedges are in position; the wedgesthus being-self-tightening when theapparatus is subjected to'jolt ram- Vining.

In testimony that I claim the foregoing as 25 my own, I have hereto aflixed my signature.

JAMES R. MGWANE; 

